Effect of Soft Particle Peening Treatment on Fatigue Strength of Copper Alloy

Author:  Koichiro NAMBU a) and Ryuji KUNIMATSU a) a) Osaka Sangyo University, Department of Mechanical Engineering, 3-1-1, Nakagaito, Daito, Osaka, Japan Email : knambu.mech@ge.osaka-sandai.ac.jp
Source:  ICSP14 Milan
Doc ID:  2022065
Year of Publication:  2022
Abstract:  
This study examined the effect of soft particle peening treatment on the fatigue strength properties of copper alloys. Walnut, apricot, peach, and polyethylene particles were used as the projectiles in the soft particle peening treatment. The hardness of these projectiles was lower than that of copper alloys, and the particles were softer. Plane bending fatigue tests showed that the number of cycles to failure increased at stresses of 140 MPa and 120 MPa regardless of the projectile material. In addition, it is considered that apricot and polyethylene particles are particularly effective in improving fatigue strength when compared with each projectile material. The results of hardness measurement showed that the hardness increased in all the projectile materials. In addition, apricot and polyethylene showed particularly large increases in hardness. Surface roughness measurements showed that surface roughness increased for all projectile materials. The increase in surface roughness was the smallest for polyethylene. The results show that polyethylene particles are effective in improving the fatigue strength of copper alloys among the particles used in this study. The results of this study suggest that the soft particle peening treatment is effective in improving the fatigue strength of copper alloys. Keywords Shot peening, Soft Particle, Fatigue, Copper alloy